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I've played a very similar game where dolphins/sharks/octopus/sea monsters all start off the map, and appear as you destroy tiles around Atlantis. I think that one was called Escape From Atlantis though. I guess many people had the same idea for a game!
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NickJul 10 '12 at 22:12

I own a copy of Survive, and I posted a link to the rulebook for Survive:Escape from Atlantis, and both games have similar if not identical rules with respect to Whale, Shark, (dolphin) setup. They don't start on the board, you only add them when you flip the appropriate tile.
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user1873Jul 11 '12 at 1:57